package usually;

public class fiber {

    public static int fib(int n) {
        if (n <= 0)
            return 0;
        if (n == 1)
            return 1;
        return fib(n-1) + fib(n-2);
    }

    public static void main(String[] args) {
        int res = fib(6);
        System.out.println("res:"+res);
    }
}
